Create a poster featuring "The Batman Who Laughs" in a menacing black suit with a white shirt and black loafers. Capture his signature creepy laugh, his face smeared with blood. In each hand, he should hold a butcher's knife, dripping with the blood of the Justice League. The background should depict him standing ominously in front of the slain bodies of the Justice League members, set in a dark, haunting environment. The ground should be a lake of blood, intensifying the gruesome atmosphere. Ensure the overall design is dark and foreboding, highlighting the terror and chaos of the scene.

verybadimagenegative_v1.3, ng_deepnegative_v1_75t, (ugly face:0.8),cross-eyed,sketches, (worst quality:2), (low quality:2), (normal quality:2), lowres, normal quality, ((monochrome)), ((grayscale)), skin spots, acnes, skin blemishes, bad anatomy, DeepNegative, facing away, tilted head, {Multiple people}, lowres, bad anatomy, bad hands, text, error, missing fingers, extra digit, fewer digits, cropped, worstquality, low quality, normal quality, jpegartifacts, signature, watermark, username, blurry, bad feet, cropped, poorly drawn hands, poorly drawn face, mutation, deformed, worst quality, low quality, normal quality, jpeg artifacts, signature, watermark, extra fingers, fewer digits, extra limbs, extra arms,extra legs, malformed limbs, fused fingers, too many fingers, long neck, cross-eyed,mutated hands, polar lowres, bad body, bad proportions, gross proportions, text, error, missing fingers, missing arms, missing legs, extra digit, extra arms, extra leg, extra foot, ((repeating hair))